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import grpc, logging, queue, threading
from common.tools.grpc.Tools import grpc_message_to_json_string
from context.client.ContextClient import ContextClient
from context.proto.context_pb2 import Empty
LOGGER = logging.getLogger(__name__)
LOGGER.setLevel(logging.DEBUG)
class EventsCollector:
def __init__(
self, context_client_grpc : ContextClient, log_events_received=False
) -> None:
self._events_queue = queue.Queue()
self._log_events_received = log_events_received
self._context_stream = context_client_grpc.GetContextEvents(Empty())
self._topology_stream = context_client_grpc.GetTopologyEvents(Empty())
self._device_stream = context_client_grpc.GetDeviceEvents(Empty())
self._link_stream = context_client_grpc.GetLinkEvents(Empty())
self._service_stream = context_client_grpc.GetServiceEvents(Empty())
self._connection_stream = context_client_grpc.GetConnectionEvents(Empty())
self._context_thread = threading.Thread(target=self._collect, args=(self._context_stream ,), daemon=False)
self._topology_thread = threading.Thread(target=self._collect, args=(self._topology_stream ,), daemon=False)
self._device_thread = threading.Thread(target=self._collect, args=(self._device_stream ,), daemon=False)
self._link_thread = threading.Thread(target=self._collect, args=(self._link_stream ,), daemon=False)
self._service_thread = threading.Thread(target=self._collect, args=(self._service_stream ,), daemon=False)
self._connection_thread = threading.Thread(target=self._collect, args=(self._connection_stream,), daemon=False)
def _collect(self, events_stream) -> None:
try:
for event in events_stream:
if self._log_events_received:
LOGGER.info('[_collect] event: {:s}'.format(grpc_message_to_json_string(event)))
self._events_queue.put_nowait(event)
except grpc.RpcError as e:
if e.code() != grpc.StatusCode.CANCELLED: # pylint: disable=no-member
raise # pragma: no cover
def start(self):
self._context_thread.start()
self._topology_thread.start()
self._device_thread.start()
self._link_thread.start()
self._service_thread.start()
self._connection_thread.start()
def get_event(self, block : bool = True, timeout : float = 0.1):
return self._events_queue.get(block=block, timeout=timeout)
def get_events(self, block : bool = True, timeout : float = 0.1, count : int = None):
events = []
if count is None:
while True:
try:
events.append(self.get_event(block=block, timeout=timeout))
except queue.Empty: # pylint: disable=catching-non-exception
break
else:
for _ in range(count):
try:
events.append(self.get_event(block=block, timeout=timeout))
except queue.Empty: # pylint: disable=catching-non-exception
pass
return sorted(events, key=lambda e: e.event.timestamp)
def stop(self):
self._context_stream.cancel()
self._topology_stream.cancel()
self._device_stream.cancel()
self._link_stream.cancel()
self._service_stream.cancel()
self._connection_stream.cancel()
self._context_thread.join()
self._topology_thread.join()
self._device_thread.join()
self._link_thread.join()
self._service_thread.join()
self._connection_thread.join()